Adjustable cut-off for engines



' (No Modelj) I 4' SheetsSheet 1.

J. REES.

ADJUSTABLE GUT-OFF FOR ENGINES. v No. 392,460. Patented Nov. 6. 1888.

WITNESSES; IIVVEIV-TOR,

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ATTORNEY,

(No Model.) I 8 4 Sheets-Sheet 2.

J. REES.

ADJUSTABLE GUT-OFF FOR ENGINES.

No. 392,460. Patented Nov. 6, 1888.

WITNESSES.- woHHuwe (imp S ch10 u ATTORNEY,

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(No Model.) 4 SheetsSheet 3 J. REES.

ADJUSTABLE GUT-OFF FOR ENGINES.

' No. 392,460. Patented Nov. 6. 1888.

INVENTOH, W aw WITNESSES:

CxeoHHmve ATTORNEY,

(No Model.) 4 Sheets-Sheet 4.

J REES.

ADJUSTABLE GUT-OFF FOR ENGINES.

No. 392,460. Patented Nov. 6 1888.

wnmsszs INIVEIVTOI? m R my. J BY 62 Q'xQuS ck'uow,

A TTORNEY.

-UNITED STATES PATENT Fries.

JAMES REES, OF PITTSBURG, PENNSYLVANIA.

ADJUSTABLE CUT-OFF FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 392,460, dated November 6, 1888.

Application filed October 2], 1887. Serial No. 253,035.

(No model.)

- burg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Adjustable Out-Off for Steam-Engines; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to an improvement in adjustable cut-offs for steam-engines, the same being an improvement on the adjustable cut-off for which Letters Patent of the United States No. 114,601 were granted to me May 9, 1871. I will proceed to describe in detail and clearly point out in the claims the several improvements of my present invention.

In the accompanying drawings, which form part of my specification, Figurel is a top view of the adjustable cut-off. Fig. 2 is a side elevation representing the position of the several parts of the cutofi when the engine is working with full open ports, commonly called full-stroke. Fig. 3 is a side elevation representing the several ports of the same when in position for cutting off. Figs. 4, 5, 6, 7, and 8 are detail views.

For the purpose of clearness of description and easy comprehension of my present improvement over my former invention described in the hereinbefore-mentioned Letters Patent, I will use the letters of reference in the drawings of said mentioned Letters Patent for corresponding parts in my present improvement.

The desideratum-in engines having a cutoff is a cut-off susceptible of quick adjustment while the engine or engines is or are in motion to cut off at any point of the stroke, simple and positive in its action, and always under easy control of the engineer. It must also be capable of cutting off at'any point from the commencement to the end of the stroke, either in going ahead or backing, and must also be so arranged as to be instantly thrown out of gear to allow the steam to be worked fullstroke, if desired, and of easy adaptation to existing styles of engines, particularly such as are used on steamboats on the Western rivers.

After an experience dating from the date of my aforesaid Letters Patent to the present time in efforts to simplify the invention therein described and make it meet the requirements above stated, I have accomplished that desired result'by arranging the sliding frame B, which carries the incline-blocks 1*, upon ways or bearings 13 B, so as to be elevated or depressed in columns A A through the medium of the sliding bar 0, having inclines F, and operated by means of a lever, D, which may have cords attached to its arms L, leading to the throttle-valve, where they may be within easy reach of the engineer.

By comparing my present invention with Y that described in the before-cited patent it will be observed that the essential features of my present improvement consist in the arrangement of the bearings or ways 13 B in the columns A A and elevating or lowering the frame B through the medium of the bearings or ways B B, which are operated by the sliding bar 0, having inclines F F, said sliding bar being operated through the medium of the lever D. The disks (1 are keyed fast to the forward rock-shaft g, to which are attached the lifters d d and b b, for operating the inlet valves. Between the two disks is the arm 6, working loosely on the shaft 9, and to which are attached by pin-j oints the pawls S S, which engage the edges of the shoulders S S on the disks 6 for the purpose of lifting the inlet valves. The arm 6 receives its motion through the medium of the link 6 and arm 6 on the rock-shaft, which receives its motion from the ordinary full-stroke cam. This motion being communicated through the abovementioned parts to the disks d d, the inletvalves are opened and held open until the incline-blocks r on the sliding frame B are brought in contact with the lugs 00 a: of the pawls S S, thus releasing them from the shoulders S S of the disks 3 and allowing the inletvalves to close, the point of closing being regu lated by adjusting the incline-blocks rby right and left hand screws 3 through the medium of the hand-wheel y of the sliding frame B,Which receives its motion through a reducing-lever, E, from the pendulum f and connecting-rods of, which in turn receives its motion from the cross-head n of the engine. By separating the blocks 1' the steam will be cut oft earlier in the stroke, and by bringing them closer together the opposite effect will be produced. \Vhen itis desired to throw the cut-off out of gear and work steam full-stroke, the sliding frame B, carrying the incline-blocks 1, is lowered by moving the bar 0 endwise, which allows the ways 13 B of the frame 13 to move down in the columns A A, thus allowing the incline-blocks r to move under the lugs w x of the pawls S S of the disks 2".

I do not confine myself to the position of the arm 6 and pawls S S and disk 2" on the shaft 1 between the disks (1 d, as said arm, pawls, and disk i may be arranged on the outer end of said shaft, if so desired, with the sliding frame 13, its ways and elevating and depressing bar being arranged accordingly.

Having thus described my improvement, what I claim in my present improvement is 1. A pair ofpawls, S S, loosely pivoted to the arm (2, the said pawls alternately engaging shoulders SPon the disk i,in combination with a reciprocating bar and adjustable tripping and disengaging devices for engaging and disengaging the pawls before the end of the stroke, substantially as herein described, and for the purpose set forth.

2. Apair of trippersp'r, adj ustably arranged on a reciprocating frame susceptible of elevation and depression, in combination with the pawls S S and engaging-lugsxx, substantially as herein described, and for the purpose set forth.

3. In combination with the vertically-adjustable and reciprocating frame I the tripperso- 1-, and screw 7 whereby the tripper may be adjusted and engaged or disengaged with the lugs a: x of the pawlsS S by a single motion, substantially as herein described.

4. The combination of the lever D, sliding bar 0, ways or bearings B B, reciprocating frame I), having adjustable trippcrs 1'1, and pawls S S, having lugs 50 a, substantially as herein described, and for thepurpose set forth.

In testimony \vhercofl. have hereunto set my hand this lZl'h day of October, A. l). 1887.

JA MES REES.

\Vitncsses:

A. C. JOHNSTON, I. (J. Pivrrnnsolv. 

